Burette



To all 10/ 10111 JOHN PETER FRANK, OF PAP'AIKOU, TERRITORY OF"HA'WAIIIBUBETTEF- Application filed March 23, 1923. Serial No. 627,230.

it may concern Be it known that 1, JOHN PETER FRANK,

a citizen of Papaikou, county of Hawaii,

have invented new and original Hawaii,

the United States, residing at Territory of lmproven'ients in Burettes,of which the following is a speclfication.

This invention relates to the design and manufacture all kinds of inlaborator so that the said burettes of a burette which will permitfluids and chemicals to be used ies and manufacturing plants willprotect the fluids and chemicals contained therein free from any dust,oxidation or other contamination,

and which may be drawn off through a stopcock fitted in person uslng thethe lower end, and to permit the same to measure the amount drawn off bymeans of units of measurement indicated upon burette.

the side of the In ordinary burettes now in use, difficulty is had infilling, rendering it necessary to use a detached funnel.

Also with such burettes it is necessary to remove detached funnel fromtop of burette and replace same with a cork as a means of keeping thesolution in the not in use.

burette free from dust, when As the cork or stopper must be againremoved when the solution is drawn off, from the bottom of burette,considerable contamination of chemicals with foreign matter ensues,chemical solutlons and oxidation of takes place when using this ordinaryburette.

To overcome these ob ect1ons and defects,

1 have therefore invented and designed a burette as shown in the singlefigure of the drawing, which is a side elevation, so that the same shallcontaln an integral funnel bowl A at the top, tension of the hollowshaft a central vertical passage 0 use a detached which bowl will be anex A of the burette, as to form a semi-globular or d openi lg, renderingit unnecfunnel for filling. below the attached funnel there al stop-cockC, provided with for the admission of fluids and chemicals to the hollowshaft 13, and

1 a a passage 0 ,for

of the burett stop-cock C i in shape,

or chemical.

an inclined vertically disposed the escape of air during filling thepassages c and 0 being in Below the hollow shaft B, cylindrical s theand adapted for holding afiuid At the lower end of the hollow cylinder Bis located a second stop-cock D which contains one transverse passage clfor draining off the fluid or chemical, said stopcock oeing made of thesame material as the complete burette. Both the upper and lowerstop-cocks are of the familiar design permitting the same to be turnedwith a handle at the side and removed for the purpose of cleaning. Theupper stop-cock may be entirely removed, and, when so removed, a brushor other mechanical cleansing utensil can be inserted directly into theburette so as to come in contact with the inside walls of the cylinder,and thus facilitate cleansing.

I claim:

I 1. In a burette, in combination, a hollow shaft portion havinggraduations thereon, a funnel at the upper end thereof and having avertical passage registering with the bore of the said shaft, astop-cock having a transverse passage adapted to connect the passagebetween the funnel and the bore of the shaft, said stop-cock alsoprovided with a second passage operably connected with the said bore andleading outside the container above the stop-cock to permit escape ofair from the shaft when filling, and to prevent entrance of extraneousmatter to said shaft when the aforesaid stopcock is in passive position,said stop-cock passages adapted to be simultaneously opened and closed,and means for discharging the contents of said shaft at its lower end.

2. In a burette, in combination, a container comprising a hollow shaftportion having graduations thereon, an integral filling funnel at theupper end of said hollow shaft and having a passageway registering withthe bore of said shaft, a turning plug mounted in said shaft below thesaid fun nel, said turning plug having a transverse vertical passagetherethrough in. register with the bore of the shaft and the outletpassage of the funnel, when the device is in filling position, saidturning plug also being provided with a second transverse passagetherethrough disposed obliquely to the vertical passage and adapted tocommunicate with the bore of the hollow shaft, and provide an air escapewhen said turning plug is in filling position, said second passagsleading outside the container above the turning plug, the outlet end ofthe verllU tioal passage and the inlet end of the ten to; the bore ofthe hollow shaft, both oblique passage lying within the area of of saidtransverse passages adapted for the bore of the hollow shaftywhen infilling simultaneous opening and closing and a 10 position, thedischarge end of said. oblique discharge stop-cock in the lower portionof 5 passage adapted to be blanked when the said shaft.

turning plug is in passive position, whereby to prevent entrance ofextraneous mat- JOHN PETER FRANK.

